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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1111/nph.17088
|2 doi
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|a pubmed24n1059.xml
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|a (DE-627)NLM317840509
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|a (NLM)33217000
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Gimeno, Teresa E
|e verfasserin
|4 aut
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| 245 |
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|a Whole-tree mesophyll conductance reconciles isotopic and gas-exchange estimates of water-use efficiency
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|c 2021
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 14.05.2021
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|a Date Revised 14.05.2021
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|a published: Print-Electronic
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|a figshare: 10.6084/m9.figshare.13234310.v2
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|a Citation Status MEDLINE
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|a © 2020 The Authors New Phytologist © 2020 New Phytologist Foundation.
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|a Photosynthetic water-use efficiency (WUE) describes the link between terrestrial carbon (C) and water cycles. Estimates of intrinsic WUE (iWUE) from gas exchange and C isotopic composition (δ13 C) differ due to an internal conductance in the leaf mesophyll (gm ) that is variable and seldom computed. We present the first direct estimates of whole-tree gm , together with iWUE from whole-tree gas exchange and δ13 C of the phloem (δ13 Cph ). We measured gas exchange, online 13 C-discrimination, and δ13 Cph monthly throughout spring, summer, and autumn in Eucalyptus tereticornis grown in large whole-tree chambers. Six trees were grown at ambient temperatures and six at a 3°C warmer air temperature; a late-summer drought was also imposed. Drought reduced whole-tree gm . Warming had few direct effects, but amplified drought-induced reductions in whole-tree gm . Whole-tree gm was similar to leaf gm for these same trees. iWUE estimates from δ13 Cph agreed with iWUE from gas exchange, but only after incorporating gm . δ13 Cph was also correlated with whole-tree 13 C-discrimination, but offset by -2.5 ± 0.7‰, presumably due to post-photosynthetic fractionations. We conclude that δ13 Cph is a good proxy for whole-tree iWUE, with the caveats that post-photosynthetic fractionations and intrinsic variability of gm should be incorporated to provide reliable estimates of this trait in response to abiotic stress
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Eucalyptus
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|a carbon stable isotope
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|a drought
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|a phloem
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|a photosynthesis
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|a respiration
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|a warming
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|a whole-tree chamber
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| 650 |
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|a Carbon Isotopes
|2 NLM
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| 650 |
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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|a Carbon Dioxide
|2 NLM
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| 650 |
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|a 142M471B3J
|2 NLM
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| 700 |
1 |
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|a Campany, Courtney E
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Drake, John E
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Barton, Craig V M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tjoelker, Mark G
|e verfasserin
|4 aut
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| 700 |
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|a Ubierna, Nerea
|e verfasserin
|4 aut
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| 700 |
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|a Marshall, John D
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 229(2021), 5 vom: 20. März, Seite 2535-2547
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:229
|g year:2021
|g number:5
|g day:20
|g month:03
|g pages:2535-2547
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|u http://dx.doi.org/10.1111/nph.17088
|3 Volltext
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|h 2535-2547
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